Abstract

Yao-dong are unique underground dwellings in the Loess Plateau of China. The only one open part of the Yao-dong tends to be made small in order to control heat loss. Therefore, although the brightness near the open part is sufficient, the farther inside, the more remarkably it decreases. We focused on the improvement on lighting conditions using light-shelf. The shapes of light-shelf used were flat and concave. As the result, the light-shelf which curvatured reflection board is the most effective in order to improve the lighting conditions especially back of the room.

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